WO2004017481A1 - Sensor protection circuit - Google Patents
Sensor protection circuit Download PDFInfo
- Publication number
- WO2004017481A1 WO2004017481A1 PCT/DE2003/002189 DE0302189W WO2004017481A1 WO 2004017481 A1 WO2004017481 A1 WO 2004017481A1 DE 0302189 W DE0302189 W DE 0302189W WO 2004017481 A1 WO2004017481 A1 WO 2004017481A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- line
- circuit
- protection circuit
- voltage
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
Definitions
- the invention relates to a sensor protection circuit, in particular for a vehicle electrical system, according to the preamble of claim 1.
- Numerous sensors are usually used in modern motor vehicles in order to detect the state of the motor vehicle or the surroundings.
- the sensors can be powered by separate supply lines that are separated from the vehicle electrical system. This offers the advantage that the sensor query is not disturbed by the generally higher load currents of the vehicle electrical system.
- Protective circuits of the sensors can consist, for example, of Zener diodes or capacitors.
- the invention is therefore based on the object of making it possible to use known sensors with a short-circuit strength up to a voltage of 12 V in a modern motor vehicle electrical system with a voltage of 42 V without the risk of damage to the sensors in the event of a short circuit ,
- the invention encompasses the general technical teaching, a
- Use sensor protection circuit that detects the current rise on the supply line in the event of a short-circuit of a supply line for a sensor and thereby enables the initiation of suitable countermeasures.
- the sensor's overvoltage protection takes effect. Thanks to fast fault detection and the quick initiation of countermeasures, sensors with a short-circuit strength below the nominal voltage of the vehicle electrical system can be used.
- the countermeasure in the event of a short circuit can be that the supply line for the sensors is separated by a switching element, which prevents a further increase in current.
- the supply line for the sensors can be separated either with one pole for the ground line or the voltage line or with two poles for the ground line and the voltage line, preferably using a switching element which is connected in series with a supply line.
- the switching element for separating the supply line for the sensors can also be controlled externally independently of the current on the supply line, for which purpose the sensor protection circuit preferably has a separate control input.
- This separate shutdown can be software-controlled, for example, if a short circuit continues for a predetermined period of time.
- the current measurement on the supply line for the sensors is preferably carried out on the ground line, but in principle it is also possible for the current to be measured on the voltage line of the sensors.
- the sensor protection circuit according to the invention preferably also has a passive protective circuit in order to prevent damage to the sensors in the event of a short circuit.
- Such a protective circuit can consist, for example, of capacitors or Zener diodes, these components te can be connected between the two supply lines for the sensors.
- the components of the passive protective circuit may connect the ground line and / or the voltage line of the sensors to ground.
- Zener diodes when using Zener diodes as passive protective circuitry, it is advantageous if the Zener diodes in the sensor protective circuit according to the invention have a lower breakdown voltage than the Zener diodes which are usually provided in the sensors as protective circuitry. This is advantageous because after a short transient phase, the short-circuit current then flows exclusively via the Zener diodes in the sensor protection circuit and no longer via the Zener diodes in the sensors, so that the Zener diodes in the sensors only transmit the short-circuit current for one have to wear for a very short period of time.
- sensor used in the context of the invention is to be understood in general terms and includes all components that are supplied with electricity and supply a measured variable. Lambda sensors, temperature sensors, pressure sensors, inclination sensors and acceleration sensors are only examples here.
- the invention is also not limited to use in future automotive electrical systems with a mains voltage of 42V. Rather, it is also possible for on-board networks with other mains voltages to be developed on the basis of corresponding standardization, in which the sensor protection circuit according to the invention can also be used.
- FIG. 1 shows a sensor protection circuit according to the invention with a sensor in the form of a circuit diagram
- FIG. 2 shows a current limiter circuit of the sensor protection circuit from FIG. 1.
- FIG. 1 shows a sensor protection circuit 1 according to the invention, which is used in a motor vehicle electrical system with a line voltage of 42 V in order to be able to operate a conventional sensor unit 2 with a short-circuit resistance of 12 V without the sensor unit 2 in the Damaged or even destroyed in the event of a short circuit.
- the sensor unit 2 is shown in FIG. 1, but a plurality of sensor units can also be operated on the sensor protection circuit 1, as indicated by the dashed lines.
- the sensor protection circuit 1 has a ground line 3 and a voltage line 4 for supplying power to the sensor unit 2, the voltage line 4 being connected on the input side to a voltage regulator 5 which regulates the voltage on the voltage line 4 to the operating voltage of the sensor unit 2, which is 5 V in this embodiment.
- the ground line 3 is connected to ground on the input side, a buffer capacitor C1 being arranged at the input of the sensor protection circuit 1 between the voltage line 4 and the ground line 3.
- the sensor unit 2 consists of the actual sensor 6, which measures a physical state variable, such as temperature, pressure or the air ratio ⁇ , and outputs a corresponding measurement signal via a signal line 7.
- a physical state variable such as temperature, pressure or the air ratio ⁇
- the sensor unit 2 has a passive protective circuit to prevent damage in the event of a short circuit. Prevent damage to the sensor 6, the passive protective circuit of the sensor unit 2 is designed for the previously common vehicle electrical system voltage of 12 V.
- the Zener diode Dl is therefore connected between the signal line 7 and the ground line 3.
- the Zener diode D2 is therefore connected between the voltage line 4 and the ground line 3.
- the passive protective circuit of the sensor unit 2 only offers a short-circuit strength compared to the previously usual on-board electrical system voltage of 12 V, whereas the passive protective circuit of the sensor unit 2 is overwhelmed when used in a modern motor vehicle electrical system with a voltage of 42 V alone.
- the sensor protection circuit 1 therefore has a current limiter 8, which is arranged in the ground line 3 for the sensor unit 2 and measures the current via the ground line 3, the current limiter 8 being shown in detail in FIG. 2 and described below.
- the current limiter 8 has a measuring resistor Rl, which is arranged in the ground line 3, so that the voltage drop across the measuring resistor Rl reflects the current flowing through the ground line 3.
- a MOSFET transistor T1 is arranged in the ground line 3, which, depending on its control, enables both a current limitation and a complete separation of the ground line 3 in the event of a short circuit.
- the gate connection of the MOSFET transistor T1 is connected to the output of a comparator circuit which consists of two resistors R3, R4 and two transistors T2 and T3.
- the comparator circuit is connected on the input side to the measuring resistor R1 and thus detects the via
- the comparator circuit controls the gate connection of the MOSFET transistor T1 in dependence on the electrical current flowing via the ground line 3 in such a way that the current is limited in order to damage the sensor 6 in the event of a short circuit prevent.
- the current limiter 8 also has a transistor T4 which connects the gate connection of the MOSFET transistor Tl to ground, so that the MOSFET transistor Tl disconnects the ground line 3 when the transistor T4 turns on, since the potential of the gate connection of the MOSFET transistor T1 is then pulled to ground.
- the control of the transistor T4 takes place via a separate control input 9 and two intermediate resistors R5, R6 by means of a software control which separates the MOSFET transistor Tl when the short-circuit case lasts for a predetermined period of time.
- the sensor protection circuit 1 to protect the sensor 6 also has a passive protective circuit, which consists of two Zener diodes D3, D4 and three capacitors C2, C3 and C4.
- the Zener diode D3 is connected between the signal line 7 and the ground line 3 and prevents an overload on the output side of the sensor 6 in the event of a short circuit between the on-board electrical system voltage of 42 V and the signal line 7.
- the Zener diode D4 is connected between the voltage line 4 and the ground line 3 and prevents an overload on the input side of the sensor 6 in the event of a short circuit between the vehicle electrical system voltage of 42 V and the voltage line 4.
- the capacitor C2 is connected between the signal line 7 and ground and thus buffers EMC voltage peaks on the signal line 7, which likewise counteracts an overload on the output side of the sensor 6.
- the capacitor C3, connects the voltage line 4 to the ground line 3 and thus buffers voltage fluctuations at the input of the sensor unit 2 and takes over the current.
- the capacitor C4 connects the ground line 3 to ground, as a result of which EMC fluctuations in the ground potential on the ground line 3 are suppressed.
- the passive protective circuit of the sensor protective circuit 1 therefore takes over the short-circuit current from the passive protective circuit of the sensor unit 2, thereby preventing the passive protective circuit of the sensor unit 2 from being overloaded.
- the current limiter 8 then limits the short-circuit current on the ground line 8 in order to prevent overloading the passive protective circuit of the sensor protective circuit 1. In the event of a persistent short circuit, the control input 9 of the current limiter 8 is then triggered, whereupon the MOSFET transistor T1 completely disconnects the ground line 3.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03787619A EP1523795A1 (en) | 2002-07-19 | 2003-07-01 | Sensor protection circuit |
US10/521,888 US7099133B2 (en) | 2002-07-19 | 2003-07-01 | Sensor protection circuit |
JP2004528336A JP2005533478A (en) | 2002-07-19 | 2003-07-01 | Sensor protection circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10232941.9A DE10232941B4 (en) | 2002-07-19 | 2002-07-19 | Vehicle electrical system with a sensor protection circuit |
DE10232941.9 | 2002-07-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004017481A1 true WO2004017481A1 (en) | 2004-02-26 |
Family
ID=30128188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/002189 WO2004017481A1 (en) | 2002-07-19 | 2003-07-01 | Sensor protection circuit |
Country Status (5)
Country | Link |
---|---|
US (1) | US7099133B2 (en) |
EP (1) | EP1523795A1 (en) |
JP (1) | JP2005533478A (en) |
DE (1) | DE10232941B4 (en) |
WO (1) | WO2004017481A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008043923A1 (en) * | 2008-11-20 | 2010-05-27 | Robert Bosch Gmbh | Protective device for at least one permanently supplied capacitor |
JP2016536958A (en) * | 2013-10-10 | 2016-11-24 | ヴァレオ システム テルミク | Electrical or electronic device with two supply voltages |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011016551A1 (en) * | 2011-04-08 | 2012-10-11 | Valeo Schalter Und Sensoren Gmbh | Driver assistance device for motor vehicle e.g. passenger car, has voltage limiting unit that is connected to internal protection circuit for limiting amplitude of voltage signals to measurable value of control unit |
DE102011118203A1 (en) * | 2011-11-11 | 2013-05-16 | Festo Ag & Co. Kg | Automation system has protection circuit with conductive paths that are coupled with protective elements in order to block electromagnetic interference which lie outside specific noise spectrum prior to transmission to terminal |
KR102007397B1 (en) | 2012-06-19 | 2019-08-05 | 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. | Interface unit having over current and over voltage protection device |
FR3021764B1 (en) * | 2014-05-27 | 2016-05-27 | Valeo Systemes Thermiques | ELECTRICAL OR ELECTRONIC DEVICE HAVING TWO POWER SUPPLY VOLTAGES |
DE102015207783B4 (en) * | 2015-04-15 | 2019-01-31 | Continental Automotive Gmbh | Overvoltage protected electronic control unit |
DE102020203591A1 (en) * | 2020-03-20 | 2021-09-23 | Robert Bosch Gesellschaft mit beschränkter Haftung | Protection device for an electronic component connected to an interface |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0497478A2 (en) * | 1991-01-28 | 1992-08-05 | John Fluke Mfg. Co., Inc. | Low impedance, high voltage protection circuit |
EP0552471A1 (en) * | 1992-01-21 | 1993-07-28 | Siemens Aktiengesellschaft | Protection circuit for electronic circuits |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4320112C2 (en) * | 1993-06-17 | 2003-10-23 | Bosch Gmbh Robert | Monolithically integrated power amplifier component with an overload protection device |
US5414792A (en) * | 1994-01-27 | 1995-05-09 | Dax Industries, Inc. | Electric throttle and motor control circuitry |
TW265482B (en) * | 1994-06-01 | 1995-12-11 | Siemens Akitengesellschaft | |
JP3752022B2 (en) * | 1995-08-25 | 2006-03-08 | 株式会社デンソー | Electronic control unit with fault diagnosis function |
ATE239999T1 (en) * | 1999-03-31 | 2003-05-15 | Pepperl & Fuchs | SAFETY BARRIER TO LIMIT CURRENT AND VOLTAGE |
JP2000332207A (en) * | 1999-05-25 | 2000-11-30 | Hitachi Ltd | Overvoltage protective circuit |
US6381114B1 (en) * | 2000-03-31 | 2002-04-30 | Micro Motion, Inc. | Integrated current source feedback and current limiting element |
-
2002
- 2002-07-19 DE DE10232941.9A patent/DE10232941B4/en not_active Expired - Fee Related
-
2003
- 2003-07-01 US US10/521,888 patent/US7099133B2/en not_active Expired - Fee Related
- 2003-07-01 WO PCT/DE2003/002189 patent/WO2004017481A1/en active Application Filing
- 2003-07-01 JP JP2004528336A patent/JP2005533478A/en active Pending
- 2003-07-01 EP EP03787619A patent/EP1523795A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0497478A2 (en) * | 1991-01-28 | 1992-08-05 | John Fluke Mfg. Co., Inc. | Low impedance, high voltage protection circuit |
EP0552471A1 (en) * | 1992-01-21 | 1993-07-28 | Siemens Aktiengesellschaft | Protection circuit for electronic circuits |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008043923A1 (en) * | 2008-11-20 | 2010-05-27 | Robert Bosch Gmbh | Protective device for at least one permanently supplied capacitor |
JP2016536958A (en) * | 2013-10-10 | 2016-11-24 | ヴァレオ システム テルミク | Electrical or electronic device with two supply voltages |
Also Published As
Publication number | Publication date |
---|---|
DE10232941B4 (en) | 2017-07-27 |
US20060114632A1 (en) | 2006-06-01 |
DE10232941A1 (en) | 2004-02-12 |
US7099133B2 (en) | 2006-08-29 |
JP2005533478A (en) | 2005-11-04 |
EP1523795A1 (en) | 2005-04-20 |
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